Posterior Security: Anonymity and Message Hiding of Standard Signatures
Published in ACM Conference on Computer and Communications Security (CCS 2025), 2025
Recommended citation: Tsz Hon Yuen, Ying-Teng Chen, Shimin Pan, Jiangshan Yu, and Joseph K. Liu. “Posterior Security: Anonymity and Message Hiding of Standard Signatures.” In Proceedings of the 2025 ACM SIGSAC Conference on Computer and Communications Security, pp. 528–542, 2025. https://doi.org/10.1145/3719027.3744797
This paper introduces posterior security for digital signatures: security properties added after a standard signature has been generated. It presents incognito signatures for posterior anonymity and concealed signatures for posterior message hiding, with applications including privacy-preserving digital-currency payments.